Performance of Lean-Burn Natural-Gas-Fueled Engines - On Specific Fuel Consumption, Power Capacity and Emissions

1990 ◽  
Author(s):  
Jacob Klimstra
Keyword(s):  
Natural Gas ◽  
Fuel Consumption ◽  
Specific Fuel Consumption ◽  
Power Capacity ◽  
Lean Burn ◽  
Gas Fueled

scholarly journals Fundamental Study on Combustion Improvement by Mixture-Flow in Natural Gas-Fueled Lean-Burn SI Engines

2000 ◽  
Vol 35 (4) ◽  
pp. 254-259
Author(s):  
Daisuke Segawa ◽  
Toshikazu Kadota ◽  
Masashi Ohno ◽  
Takeshi Mizobuchi ◽  
Katsumi Kataoka ◽  
...  
Keyword(s):  
Natural Gas ◽  
Lean Burn ◽  
Mixture Flow ◽  
Fundamental Study ◽  
Si Engines ◽  
Gas Fueled

Influence of exhaust residuals on combustion phases, exhaust toxic emission and fuel consumption from a natural gas fueled spark-ignition engine

2018 ◽  
Vol 165 ◽  
pp. 440-446 ◽  
Author(s):  
Stanislaw Szwaja ◽  
Ehsan Ansari ◽  
Sandesh Rao ◽  
Magdalena Szwaja ◽  
Karol Grab-Rogalinski ◽  
...  
Keyword(s):  
Natural Gas ◽  
Fuel Consumption ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Toxic Emission ◽  
Gas Fueled

Rare earths (Ce, Y, Pr) modified Pd/La 2 O 3 ZrO 2 Al 2 O 3 catalysts used in lean-burn natural gas fueled vehicles

2017 ◽  
Vol 35 (11) ◽  
pp. 1077-1082 ◽  
Author(s):  
Haoxin Liu ◽  
Baiwen Zhao ◽  
Yusheng Chen ◽  
Chengjun Ren ◽  
Yaoqiang Chen
Keyword(s):  
Natural Gas ◽  
Rare Earths ◽  
Lean Burn ◽  
Gas Fueled

Lean Burn Natural Gas Fueled S.I.Engine and Exhaust Emissions

1995 ◽  
Author(s):  
K.S. Varde ◽  
N. Patro ◽  
Ken Drouillard
Keyword(s):  
Natural Gas ◽  
Exhaust Emissions ◽  
Lean Burn ◽  
Gas Fueled

scholarly journals Investigation of cycle skipping methods in an engine converted to positive ignition natural gas engine

2021 ◽  
Vol 13 (9) ◽  
pp. 168781402110454
Author(s):  
Erdal Tunçer ◽  
Tarkan Sandalcı ◽  
Yasin Karagöz
Keyword(s):  
Natural Gas ◽  
Fuel Consumption ◽  
Electronic Control Unit ◽  
Engine Performance ◽  
Control Unit ◽  
Operating Conditions ◽  
Spark Ignition Engine ◽  
Specific Fuel Consumption ◽  
Electronic Throttle ◽  
Operating Modes

In this study, a single cylinder of 1.16 L, naturally aspirated engine was converted to a spark ignition engine, which was a diesel engine operating with natural gas as fuel. By placing electronic throttle, electronic ignition module, gas fuel injectors and proximity sensors on the test engine, the engine has been turned into a positive ignition engine that can work with natural gas as fuel, thanks to the electronic control unit developed by our project team. Then, in the study performed, different cycle skipping strategies were experimentally investigated at a constant engine speed of 1565 rpm, in accordance with the generator operating conditions. Engine performance, emissions (CO, HC, and NOx), and combustion characteristics (cylinder pressure, rate of heat release, etc.) of cycle skipping strategies were experimentally investigated with natural gas as fuel in Normal, 3N1S, 2N1S, and 1N1S engine operating modes. According to the results obtained, specific fuel consumption, CO and HC values improved in all cycle skipping operating conditions, except for NOx, but the best results were obtained in 2N1S operating conditions; it was concluded that the specific fuel consumption, CO and HC values improved by 11.19%, 61.89%, and 65.60%, respectively.

Development of a Lean Burn Methane Number Measurement Technique for Alternative Gaseous Fuel Evaluation

2013 ◽  
Author(s):  
Daniel M. Wise ◽  
Daniel B. Olsen ◽  
Myoungjin Kim
Keyword(s):  
Natural Gas ◽  
Landfill Gas ◽  
Pressure Sensors ◽  
Operating Conditions ◽  
Liquefied Petroleum Gas ◽  
Lean Burn ◽  
Pressure Transducers ◽  
Wide Range ◽  
Gas Fueled ◽  
Methane Number

A wide range of fuels are used in industrial gas fueled engines. Fuels include well-head gas, pipeline natural gas, producer gas, coal gas, digester gas, landfill gas, and liquefied petroleum gas. Many industrial gas fueled engines operate at high power density and at ultra-lean air-fuel ratios for low NOx emissions. Engines operate in a narrow air-fuel ratio band between misfire and knock limits. To utilize this wide range of fuels effectively it is important to understand knock properties. Methane number determination for natural gas blends is traditionally performed with research engines at stoichiometric conditions where the onset of knock is identified through subjective audible indication. The objective of this paper is to develop a process to determine knock onset through direct indication from pressure transducer data at lean operating conditions characteristic of lean-burn industrial gas engines. Validation of the method is provided with methane number determination and comparison of pipeline natural gas. A Waukesha F2 Cooperative Fuel Research (CFR) engine is modified to incorporate piezoelectric pressure transducers at the cylinder head and conversion from natural aspiration to boosted intake and variable exhaust back pressures (to simulate turbocharger operation). The new pressure sensors enable Fast Fourier Transform calculation of pressure data to calculate amplitude at characteristic knock frequency.

Analysis of experimental results with an active pre-chamber ultra-lean burn SI engine

2020 ◽  
pp. 146808742097454
Author(s):  
Christoph Müller ◽  
Stefan Pischinger ◽  
Sascha Tews ◽  
Andreas Müller ◽  
Knut Habermann
Keyword(s):  
Natural Gas ◽  
Fuel Consumption ◽  
Gasoline Engine ◽  
Combustion Process ◽  
Experimental Investigations ◽  
Major Step ◽  
Lean Burn ◽  
Hybrid Powertrain ◽  
Engine Operation ◽  
Gasoline Engines

To ensure that private cars can continue to be used in the future, they must become significantly more efficient and at the same time emit considerably less pollutants. In addition to pure electric drives, further optimized gasoline engines in hybrid powertrain configurations still offer major potentials in this respect. A major step toward increasing efficiency can be achieved by extremely lean burn combustion. If, in addition to low fuel consumption, this operation should also simultaneously reduce NOx raw emissions, lean-burn operation with relative air/fuel ratios of λ≥ 2 must be enabled in wide ranges of the engine operation map. Within the scope of this publication, results of experimental investigations with a lean burn pre-chamber ignition system applied to a small gasoline engine with 75 mm bore and 90.5 mm stroke are presented. In this context, the effects of the pre-chamber design on emissions and fuel consumption are examined. By comparing different pre-chamber enrichments with natural gas and conventional RON98 gasoline, it can be shown that with the direct liquid injection of gasoline into the pre-chamber similar good thermodynamic results as with natural gas can be achieved with the advantage of easier integration of a single fuel system. Due to its significantly improved lean burn capability with relative air/fuel rations of up to λ = 3, combined with low specific indicated NOx raw emissions of less than 0.1 g/kWh, the presented lean-burn combustion system offers excellent conditions for further efficiency improvements of electrified powertrains. WLTP cycle simulations based on measured engine maps for the developed combustion process resulted in a fuel consumption reduction of up to 10%. At the same time, NOx raw emissions below the Euro 6d limit of 60 mg/km can be achieved.

Effect of Stationary Natural Gas Engine Oils on Fuel Economy

2012 ◽  
Author(s):  
Nikhil Dayanand ◽  
John D. Palazzotto ◽  
Alan T. Beckman
Keyword(s):  
Natural Gas ◽  
Fuel Consumption ◽  
Fuel Economy ◽  
Operating Conditions ◽  
Specific Fuel Consumption ◽  
Engine Oil ◽  
Brake Specific Fuel Consumption ◽  
Oil Viscosity ◽  
Gas Engine ◽  
Natural Gas Engine

In order to investigate the possible environmental and economic benefits of lubricants optimized for stationary natural gas engine efficiency, a decision was made to develop a test stand to quantify the effects of lubricant viscosities and formulations on the brake specific fuel consumption. Many fuel economy tests already exist for evaluating gasoline and heavy duty diesel motor oils which have proven the benefit of fuel economy from different lubricant formulations. These engines would not be suitable tools for evaluating the fuel economy performance of lubricating oils formulated specifically for stationary natural gas engines, since there are significant differences in operating conditions, fuel type, and oil formulations. This paper describes the adaptation of a Waukesha VSG F11 GSID as a tool to evaluate fuel consumption performance. The performance of brake specific fuel consumption when using different formulations was measured at selected high loads and rated speed. The results of the testing program discuss the viscosity and additive effects of stationary natural gas engine oil formulations on brake specific fuel consumption. The results will detail the change in brake specific fuel consumption between natural gas engine oil formulations blended to varying viscosities and compared to a typical natural gas engine oil formulation with a viscosity of 13.8 cSt @ 100°C. The second portion of the test program explores the effect of different additive packages that were blended to the same finished oil viscosity. It was acknowledged that there were statistical differences in brake specific fuel consumption characteristics between lubricants different in viscosity and additive formulations.

Effects of Humidity and Ambient Temperature on Engine Performance of Lean Burn Natural Gas Engines

2006 ◽  
Author(s):  
Andreas Wimmer ◽  
Eduard Schnessl
Keyword(s):  
Natural Gas ◽  
Fuel Consumption ◽  
Engine Performance ◽  
Optimal Operation ◽  
Nox Emission ◽  
Engine Fuel ◽  
Ambient Conditions ◽  
Lean Burn ◽  
Combustion Duration ◽  
Burn Rate

High demands are placed on large gas engines in the areas of performance, fuel consumption and emissions. In order to meet all these demands, it is necessary to operate the engine in its optimal range. At high engine loads the optimal operation range becomes narrower as the engine comes closer to the knocking or to the misfire limit. The ambient conditions are of increasing importance in this range of operation. Variations in humidity influence the engine’s burn rate characteristics. An increase in humidity reduces the burn rate and increases the combustion duration. This increase in combustion duration has the same effect as retarding the time of ignition. Thus the thermal efficiency is reduced. Additionally, the engine is more likely to misfire as humidity increases. The cylinder temperature affects the engine fuel efficiency, knocking, exhaust gas temperature and particularly NOx emission. An increase in manifold air temperature results in higher NOx emission, heat transfer and knocking tendency. To avoid knocking, the time of ignition must be retarded resulting in lower engine efficiency. In this paper the effects of changes in humidity and temperature of the intake air on engine performance were examined in a lean burn pre-chamber natural gas engine. Tests on a single cylinder research engine were carried out. Effects on knocking and misfire limit, NOx emissions and fuel consumption were investigated depending on engine load. The interpretation of the results was supported by an extended analysis of losses.

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